Blockchain 101 Certification Blockchain 101 Certification Consensus Mechanisms & Protocols

Question 1

Which consensus mechanism requires participants to solve computationally intensive puzzles to validate transactions?

Accepted Answer

Proof of Work

Answer

Proof of Stake

Answer

Delegated Proof of Stake

Answer

Proof of Authority

Question 2

In a Proof of Stake consensus model, what determines a validator's chance of being selected to create the next block?

Accepted Answer

Amount of staked cryptocurrency

Answer

Hash rate

Answer

Network latency

Answer

Number of transactions processed

Question 3

What is a Byzantine Fault in the context of distributed blockchain consensus?

Accepted Answer

Arbitrary or malicious behavior by a node

Answer

A network timeout error

Answer

A double-spend transaction

Answer

A fork in the blockchain

Question 4

Which consensus protocol is commonly used in permissioned enterprise blockchains like Hyperledger Fabric?

Accepted Answer

Practical Byzantine Fault Tolerance (PBFT)

Answer

Proof of Work

Answer

Nakamoto Consensus

Answer

Proof of Burn

Question 5

What is a blockchain fork?

Accepted Answer

A divergence in the blockchain creating two separate chains

Answer

A cryptographic key split

Answer

A type of smart contract

Answer

A network upgrade tool

Question 6

In Delegated Proof of Stake (DPoS), who actually validates transactions?

Accepted Answer

A small number of elected delegates

Answer

All token holders simultaneously

Answer

Anonymous miners

Answer

Only the blockchain founder